Quantifying large-scale continental shelf margin growth and dynamics across middle-Cretaceous Arctic Alaska with detrital zircon U-Pb dating
Quantifying large-scale continental shelf margin growth and dynamics across middle-Cretaceous Arctic Alaska with detrital zircon U-Pb dating
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利用碎屑锆石 U-Pb 测年量化中白垩世北极阿拉斯加的大规模大陆架边缘增长和动态
DOI：
10.1130/g49118.1
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发表时间：
2022
期刊：
影响因子：
5.8
通讯作者：
A. Kylander‐Clark
中科院分区：
文献类型：
--
作者：
R. Lease;D. Houseknecht;A. Kylander‐Clark
层序地层学提供了一个统一的框架，整合不同的意见，解释沉积盆地的演化，但是，关键的时间假设跨越数百公里的地层元素很少量化。结合28个样品的新碎屑锆石U-Pb（DZ）年龄和地震填图，建立了一个跨越800 km ~20百万年的年代地层格架。美国阿拉斯加北极地区中白垩世Torok-Nanushuk斜坡。大陆架边缘DZ日期表明大陆规模的沉积物路由与俄罗斯楚科奇起源，并提供可靠的最大沉积年龄来自弧火山作用。大陆架边缘的进步率显示出明确的关系，顶超轨迹，并提供经验支持长期以来的推论连接沉积物供应的边缘架构。两种不同的货架边缘生长制度是明显的：（1）约。115-107 Ma快速~50 km/m.y.（2）一个以横向轨迹为主的大陆架推进速率; 107-98 Ma，中等~13 km/m.y.大陆架推进速率与海侵-海退-加积轨迹。我们建立了一个随后的货架深水相关的独立约会约。98-95 Ma低陆棚容纳和盆地底部沉积远至240 km以东，表明低位脱落和改变局部路由与布鲁克斯山脉物源。最后，我们约会了一次。95 Ma的全盆地海侵在深水陆棚设置跨越350公里，表现出明显的同步性与事件的重要表面一致。在世界上最大的前陆盆地斜坡带之一，我们的工作限制了关键沉积元素的时间和持续时间，以测试大规模的层序地层假设，使800公里的沉积动力学的可靠的相关性和量化，并捕捉一个巨大的海退-海侵循环的年表。
Sequence stratigraphy provides a unifying framework for integrating diverse observations to interpret sedimentary basin evolution; however, key time assumptions about stratigraphic elements spanning hundreds of kilometers are rarely quantified. We integrate new detrital zircon U-Pb (DZ) dates from 28 samples with seismic mapping to establish a chronostratigraphic framework across 800 km and ~20 m.y. for the middle-Cretaceous Torok-Nanushuk clinothem of Arctic Alaska (USA). Shelf-margin DZ dates indicate continent-scale sediment routing with Russian Chukotka provenance and provide reliable maximum depositional ages derived from arc volcanism. Shelf-margin advance rates display a clear relationship to toplap trajectories and provide empirical support for long-held inferences linking sediment supply to margin architecture. Two distinct shelf-margin growth regimes are evident: (1) a ca. 115–107 Ma phase of rapid ~50 km/m.y. shelf advance rates with mainly progradational trajectories; and (2) a ca. 107–98 Ma phase of moderate ~13 km/m.y. shelf advance rates with progradational-retrogradational-aggradational trajectories. We established a subsequent shelf–to–deep water correlation by independently dating ca. 98–95 Ma low shelf accommodation and basin-floor deposition as far as 240 km east that indicate lowstand shedding and a change to localized routing with Brooks Range provenance. Finally, we dated a ca. 95 Ma basin-wide transgression at deep-water to shelfal settings across 350 km that exhibits apparent synchroneity consistent with an event-significant surface. In one of the world’s largest foreland-basin clinothems, our work constrains the timing and duration of key depositional elements to test large-scale sequence stratigraphic assumptions, enables reliable correlation and quantification of sediment dynamics across 800 km, and captures the chronology of a giant regressive-transgressive cycle.
造山带移植：阿拉斯加布鲁克斯山脉中部的塔科尼-加里东弧岩浆作用
影响因子：
4.9
作者：
Strauss, Justin V.;Hoiland, Carl W.;Ward, William P.;Johnson, Benjamin G.;Nelson, Lyle L.;McClelland, William C.
通讯作者：
McClelland, William C.